INT 15 - SYSTEM - POINTING DEVICE BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. INTERFACE - READ FROM POINTER PORTIBM PC Portable (uses same BIOS as XT)
	AX = C209h
Return: BL = first byte read from pointing device
	CL = second byte read
	DL = third byte read
Note:	IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. classifies this function as optional
SeeAlso: AX=C200h,AX=C208h